RFR: 8255074: sun.nio.fs.WindowsPath::getPathForWin32Calls synchronizes on String object

[Igor Ignatyev]

Hi all,

could you please review this small and trivial patch?

from JBS:
`sun.nio.fs.WindowsPath::getPathForWin32Calls` synchronizes on `path` field, which is a `String` object:
        if (type != WindowsPathType.DRIVE_RELATIVE) {
            synchronized (path) {
                pathForWin32Calls = new WeakReference<String>(resolved);
            }
        }
this might lead to a deadlock, synchronizing on `this` is appropriate here.

testing:
* [ ] tier1
* [x] `test/jdk/java/nio` on windows-x64

-------------

Commit messages:
 - update copyright
 - 8255074: sun.nio.fs.WindowsPath::getPathForWin32Calls synchronizes on String object

Changes: https://git.openjdk.java.net/jdk/pull/774/files
 Webrev: https://webrevs.openjdk.java.net/?repo=jdk&pr=774&range=00
  Issue: https://bugs.openjdk.java.net/browse/JDK-8255074
  Stats: 2 lines in 1 file changed: 0 ins; 0 del; 2 mod
  Patch: https://git.openjdk.java.net/jdk/pull/774.diff
  Fetch: git fetch https://git.openjdk.java.net/jdk pull/774/head:pull/774

PR: https://git.openjdk.java.net/jdk/pull/774